id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
951	IMPORTANT: Option VAR_RHO_2D in the TLM, RPM, and ADM	arango		"The option **VAR_RHO_2D** activates the baroclinic pressure gradient response to the perturbation of the free surface in the presence of stratification and bathymetry. This option does not pass the sanity check of the tangent linear (**TLM**) and adjoint (**ADM**) models. Thus, in **globaldefs.h** we had the constraint,
 {{{
#ifdef SOLVE3D
# if !(defined ADJOINT || defined TANGENT)
#   define VAR_RHO_2D
# endif
#endif
}}}

which also affects the nonlinear kernel. This constraint is removed, and we use **VAR_RHO_2D_NOT_YET** in the **TLM**, **RPM**, and **ADM** kernels instead. Removing this term can be considered part of the linearization."	upgrade	closed	major	Release ROMS/TOMS 4.2	Nonlinear	4.1	Done